These ModuTrac locomotives are in use in PT Freeport’s Grasberg underground mine in Indonesia. In one of the world’s largest copper mines and simultaneously the world’s currently largest gold mine, they transport all of the extracted material in a driverless, round-the-clock, fully automated system. The predecessors of these locomotives still operate in the Andes mountains of Chile. They also work underground in the Esmeralda mine, which is part of the El Teniente mining complex operated by Codelco.